Varec 8300 series, Installation And Operation Manual, Page: 73 / 150

8303
Varec, Inc. 63
5.6 Modbus I/O (MFIO)
The Modbus I/O Module point is used for communicating with Allen Bradley Flex I/
O Modules. The MFIO point lets you specify what Modbus data is read from the Allen
Bradley Module and it also allows data configuration.
5.6.1 Parameters
The database parameters used by the MFIO point are listed and described below:
Configuration Parame-
ters Function
Tag A Tag can contain 15 bytes of data and can include any printable ASCII
character. Tags can be used to identify points indicating the use of the point
such as “Modbus Slave” or “Register Value1.” The default tag is set to “MFIO.00”
Chan Physical channel number the Allen Bradley is connected to. On the 8203 Dual
RS-485 Communications Interface Module the Chan can be set to 1 or 2. On the
8303 TGI motherboard, the Chan can be set to 0, 1 or 2.
BaudRate Baud Rate for communications to the Slave device. Valid values are: 1200, 2400,
4800, 9600 and 19200. The default is 19200.
ComParams Defines the number of data bits and the parity used by the com port. Valid
values include:
8N - 8 data bits, No parity
8O - 8 data bits, Odd parity
8E - 8 data bits, Even parity
7O - 7 data bits, Odd parity
7E - 7 data bits, Even parity
The default is 8N.
ID Physical Address of the Allen Bradley Module.
ReadCmd Command used to Read data from the Allen Bradley. Usually 3 or 4. Default is 3.
WriteCmd Command used to Write data to the Allen Bradley. Usually 5 or 6. Default is 6.
Addr1
Size1 Data Address and Size. This is the register data read from the Allen Bradley
Module. Addr1 is the register start address. The Size1 parameter determines
how many values are read. Default is 8. The values can be seen in the Value1-8
parameters. Consult the Allen Bradley documentation for more information
Addr2, Value_2
Addr3, Value_3
Addr4, Value_4 These parameters are used to send data to the Configuration Registers of the
Allen Bradley Module. They are written to the Allen Bradley as soon as
communication is established. AddrX determines the Address of the point, while
Value_X is the actual data written to AddrX. For more information on the
configuration registers, consult the Allen Bradley documentation.
Offset Input range offset used for scaling the input values.
Scale Input range scale used for scaling the input values.
ValueMin Output range offset used for scaling the output values.
ValueMax Output range scale used for scaling the output values.
Report Causes automatic notification to the Host (in response to a Change of State
Request) when a value changes. Parameter value can be High, Low or No.
Report=No disables automatic notification. Points with Report = High will be
sent before points with Report = Low. The default is High.